<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
*{ margin:0
	padding:0}
#father{
	width:700px;
	height:700px;
	margin:auto;
	
	
	}
#上{
	width:700px;
	height:90px;
	background-color:#009;
	margin-bottom:10px;}
#左{ width:200px;
	height:500px;
	background-color:#336;
	float:left;}
#中{
	width:280px;
	height:500px;
	background-color: #693;
	float:left;
	margin-left:10px;
	margin-right:10px;}
#右{
	width:200px;
	height:500px;
	background-color:#F93;
	float:left;}
#下{
	width:700px;
	height:90px;
	background-color:#0FF;
	float:left;
	margin-top:10px;}


</style>


</head>

<body>
<div>
<div id="father"> 
	<div id="上">上</div>
    <div id="左">左</div>
    <div id="中">中</div>
    <div id="右">右</div>
    <div id="下">下</div>
  
    
</div>
</body>
</html>
